Cause:
InfraStruXure PDU's using the legacy DCAL protocol brain (0m-4500) have an issue that may cause InfraStruXure Central to report a false 'Atypical Bypass' event.

Resolution:
This issue has been resolved in an updated revision of the PDU brain (0m-5103) which fully supports SNMP communication and ISX Central essential alerts. If you are seeing this error reported, please check the xPDU model as reported by InfraStruXure Central. If it is 0m-4500, you have the legacy PDU brain and should contact APC Technical Support for further steps to resolve this issue.